PHP+Gtk实例(求24点)

最近要安排我为BIT提供的《PHP高级应用–关于PHP你不知道的》一门课的讲课素材, 其中有部分涉及到PHP和Gtk2开发桌面应用的部分, 于是抽空就想写一了一个demo出来.
这是一个经典的求24的算法的PHP实现, 加上了Gtk2的界面, 其实也没什么复杂的, 和MFC开发没什么太大的区别， 唯一的不爽， 就是要自己用代码来写布局。。。
有兴趣的同学可以看看.
后记: 这里有一个网页版的, 可以用来玩玩: http://www.laruence.com/stashes/compute.php


运行截图完整源代码(PHP-Gtk example):

<?php/** * A 24 maker * @version 1.0.0 * @author laruence<laruence at yahoo.com.cn> * @copyright (c) 2009 http://www.laruence.com */class TwentyFourCal extends GtkWindow {	private $chalkboard;	private $inputs;	public  $needle = 24;	public  $precision = '1e-6';	function TwentyFourCal() {		parent::__construct();		$this->draw();		$this->show();	}	/**	 * 画窗体方法	 */	public function draw() {		$this->set_default_size(200, 200);		$this->set_title("24计算器");		$mesg   = new GtkLabel('Please input 4 integer(0-99):');		$this->chalkboard = new GtkLabel();		$this->inputs = $inputs = array(			new GtkEntry(),			new GtkEntry(),			new GtkEntry(),			new GtkEntry()		);		/**		 * container		 */		$table = new GtkTable(4, 1, 0);		$layout = array(			'left'  => 0,			'right' => 1,			'top'	=> 0,			'bottom' => 1,		);		$vBox = new GtkVBox(false, true);		$vBox->pack_start($mesg);		foreach ( $inputs as $input ) {			$input->set_max_length(2);			$table->attach($input, $layout['left'], $layout['right'],				$layout['top']++, $layout['bottom']++);		}		$vBox->pack_start($table);		$button = new GtkButton("Calculate");		$button->connect("clicked", array($this, "calculate"));		$vBox->pack_start($this->chalkboard);		$vBox->pack_start($button, true, false);		$this->add($vBox);	}	public function show() {		$this->show_all();    // 显示窗体	}	private function notice($mesg) {		$this->chalkboard->set_text($mesg);	}	/**	 * 取得用户输入方法	 */	public function calculate() {		$operants = array();		$inputs   = $this->inputs;		foreach ($inputs as $input) {			$number = $input->get_text();			if (!preg_match('/^\s*\d+\s*$/', $number)) {				$this->notice('pleas input for integer(0-99)');				return ;			}			array_push($operants, $number);		}		$length = count($operants);		try {			$this->search($operants, 4);		} catch (Exception $e) {			$this->notice($e->getMessage());			return;		}		$this->notice('can\'t compute!');		return;	}	/**	 * 求24点算法PHP实现	 */	private function search($expressions, $level) {		if ($level == 1) {			$result = 'return ' . $expressions[0] . ';';			if ( abs(eval($result) - $this->needle) <= $this->precision) {				throw new Exception($expressions[0]);			}		}		for ($i=0;$i<$level;$i++) {			for ($j=$i+1;$j<$level;$j++) {				$expLeft  = $expressions[$i];				$expRight = $expressions[$j];				$expressions[$j] = $expressions[$level - 1];				$expressions[$i] = '(' . $expLeft . ' + ' . $expRight . ')';				$this->search($expressions, $level - 1);				$expressions[$i] = '(' . $expLeft . ' * ' . $expRight . ')';				$this->search($expressions, $level - 1);				$expressions[$i] = '(' . $expLeft . ' - ' . $expRight . ')';				$this->search($expressions, $level - 1);				$expressions[$i] = '(' . $expRight . ' - ' . $expLeft . ')';				$this->search($expressions, $level - 1);				if ($expLeft != 0) {					$expressions[$i] = '(' . $expRight . ' / ' . $expLeft . ')';					$this->search($expressions, $level - 1);				}				if ($expRight != 0) {					$expressions[$i] = '(' . $expLeft . ' / ' . $expRight . ')';					$this->search($expressions, $level - 1);				}				$expressions[$i] = $expLeft;				$expressions[$j] = $expRight;			}		}		return false;	}	function __destruct() {		Gtk::main_quit();	}}new TwentyFourCal();Gtk::main();    //进入GTK主循环?>

GTK1的API Reference : http://gtk.php.net/manual/en/gtk.gtkentry.php
GTK2的API Reference: 很不完整

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